The goal of this clinical trial is to evaluate the effect of a physiotherapy intervention program in the lumbopelvic area in chronic low back pain patients. The main questions it aims to answer are: 1. Is a specific stretching and strengthening program for the hip musculature beneficial for function and symptom reduction in patients with non-specific chronic low back ain? 2. Are patients who have greater hip extension dysfunction going to benefit more from a specific program of stretching and strengthening of hip muscles? 3. Are there more alteration in pelvis alignement and movement in standig position compared to seated position in those patiens with lesser hip range of movement? 4. Are patiens with lesser hip range of movement going to show more dysfunction in the lumbopelvic region? Participants will: * Visit the physiotherapy clinic once a week to complete the therapeutic exercise session. * Repeat the session in their houses if its possible between 3 or 4 times a week and record the number of days they repeat the session at home. * Answer some questionaires at the begining of the intervention, after 4 weeks, a month and three months.
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Hip flexors range of movement
Timeframe: From the enrollement to the end of the treatment at 4 weeks
Hip flexors range of movement
Timeframe: From the enrollement to the end of the treatment at 4 weeks